Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of CombustionMedium2 minQB
ChemistryMediumsingle choice
ΔHf° for CO2(g) and H2O(l) are -94.0 and -68.3 kcal/mol. ΔHf° for acetic acid is one-half of the enthalpy of combustion of the acid and has the same sign as the latter. ΔHf° of acetic acid is
Options:
Answer:
A
Solution:
CH3COOH(l) + 2O2(g) → 2CO2(g) + 2H2O(l). Let Δf H = x: ΔHc = 2(-94.0) + 2(-68.3) - x = -324.6 - x. Given x = ΔHc / 2 (same sign): 2x = -324.6 - x, so 3x = -324.6 and x = -108.2 kcal/mol. This is option (a).
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Combustion
⏱ 2mℹ️ Source: QB
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